Three-dimensional tracking method and system based on fast positioning of image dimension and area

The invention provides a three-dimensional tracking method and system based on fast positioning of an image scale and area. The method comprises steps as follows: a scale pyramid is built according to a template image; first feature points are extracted from the pyramid; an image of each scale in the pyramid is subjected to area partition, and a key frame data structure is generated according to area information and the first feature points corresponding to areas; second feature points are extracted from a screen image; a pose of a camera is estimated, and key frame area boundaries are projected to the screen image; candidate key frame sequences are selected according to projection results; feature point matching is performed according to the second feature points of the screen images and first feature points of the candidate key frame sequences; the pose of the camera is computed according to a matching result of the feature points. The method has the advantage of a high three-dimensional ...

Method for extracting inner outline of cornea from optical coherence tomography image of anterior segment of eye and method for extracting inner outline of anterior chamber from optical coherence tomography image of anterior segment of eye

Back propagation (BP) neural network based method for predicting service life of rubber absorber

The invention discloses a back propagation (BP) neural network based method for predicting service life of a rubber absorber. According to the method, a BP neural network model of aging life of the rubber absorber is created firstly; according to the created BP neural network model of the aging life of the rubber absorber as well as fatigue life, a BP neural network model of the service life of the rubber absorber is created; and finally, the service life of the rubber absorber is predicted through the BP neural network model of the service life. In the method, aging factors and fatigue factors affecting the use of the rubber absorber are combined, a service life prediction model of the rubber absorber is reasonably created, the service life of the rubber absorber affected by both aging and fatigue is accurately predicted, and the defect of inaccurate prediction of service life of the rubber absorber due to separate research of aging life and fatigue life is overcome.

Air valve and steam cooking device

The utility model relates to the technical field of valves, in particular to an air valve and a steam cooking device. The air valve comprises a shell, a valve element, a worm wheel, a worm and a powermechanism, the power mechanism is used for driving the worm to rotate, the worm and the worm wheel are in meshing transmission, the worm wheel and the valve element are coaxially fixed, the valve element is pivoted to the shell, and the valve element rotates to open and close the air valve. The steam cooking device comprises the air valve. According to the air valve and the steam cooking device,the problem of clamping stagnation is not prone to occurring in the opening and closing process of the air valve, and reliability is high; besides, the valve core of the air valve can rotate by a large angle so as to enlarge the opening of the air valve when the air valve is opened, so that the cold air passing through the air valve in unit time can be increased, and the cooling efficiency of theinner ...

Method for predicting service life of rubber shock absorber

The invention discloses a method for predicting a service life of a rubber shock absorber; the method comprises the steps: combining aging factors, influencing the use of the rubber shock absorber, and fatigue factors; firstly, establishing an aging service life prediction mathematic model of the rubber shock absorber in use of a hot air accelerated aging test; secondly, establishing a model relationship between static rigidity of a new absorber and fatigue times by means of the aging service life prediction model and the existing performance parameter of an old absorber; further, establishing a relation model between the static rigidity and the time and obtaining a service life prediction model of the rubber shock absorber, thereby realizing prediction of the service life of the rubber shock absorber. The aging factors and the fatigue factors are combined well to predict the service life of the rubber shock absorber, and the prediction precision is high.

Online predication method for Mooney viscosity of rubber compound of rubber open mill

The invention provides an online predication method for Mooney viscosity of a rubber compound of a rubber open mill. According to the online predication method, the Mooney viscosity of the rubber compound is predicated in a predicted mixing process by using various process parameters of rubber materials with different formulas, which are detected in the rubber mixing process by the open mill, and an established mathematical model of the Mooney viscosity and the process parameters; and the established mathematical model of the Mooney viscosity and the process parameters is an online predication mathematical model established by adopting a stepwise regression method. According to the online predication method, the Mooney viscosity of the rubber compound of the rubber open mill can be predicated online by detection without staying so that the rubber staying time is saved; a statistics principle is applied so that a predicated result has high accuracy and reference value, and the rubber mixing ...

Method for extracting inner outline of cornea from optical coherence tomography image of anterior segment of eye and method for extracting inner outline of anterior chamber from optical coherence tomography image of anterior segment of eye

The invention provides a method for extracting an inner outline of a cornea from an optical coherence tomography image of an anterior segment of an eye. The method comprises the following steps of: performing smooth curve fitting on lower edge points on the central part of the cornea; performing the smooth curve fitting on the lower edge points on the two sides of the cornea; and splicing the smooth curves of the lower edge points on the central part of the cornea and the lower edge points on the two sides of the cornea to acquire the inner outline of the cornea. The invention also provides amethod for extracting the inner outline of an anterior chamber from the optical coherence tomography image of the anterior segment of the eye. By the method for extracting the inner outline of the cornea from the optical coherence tomography image of the anterior segment of the eye and the method for extracting the inner outline of the anterior chamber from the optical coherence tomography image of ...